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Supplemental disclosure of cash flow information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Supplemental disclosure of cash flow information |  |
Interest paid in cash | $ 2,814 | $ 12,534
Non-cash transactions: |  |
Dividends declared but not paid | 1,282,086 | 1,276,505
Transfers from inventory to property, plant and equipment and construction in progress | 443,018 | 400,004
Transfers from construction in progress to property, plant and equipment | 7,755,375 | 14,398,624
Transfers from other assets to construction in progress | 0 | 2,137,341
Right-of-use assets obtained in exchange for new operating lease liabilities | $ 5,148,138 | $ 0

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